[NoStatePrefetch] Do not send responses to renderer in prefetch mode.

content/renderer/render_frame_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 4034 matching lines @@
   extra_data->set_allow_download(
       navigation_state->common_params().allow_download);
   extra_data->set_transition_type(transition_type);
   extra_data->set_should_replace_current_entry(should_replace_current_entry);
   extra_data->set_transferred_request_child_id(
       navigation_state->start_params().transferred_request_child_id);
   extra_data->set_transferred_request_request_id(
       navigation_state->start_params().transferred_request_request_id);
   extra_data->set_service_worker_provider_id(provider_id);
   extra_data->set_stream_override(std::move(stream_override));
+  bool is_prefetch =
+      GetContentClient()->renderer()->IsPrefetchOnly(this, request);
+  extra_data->set_is_prefetch(is_prefetch);
+  extra_data->set_download_to_network_cache_only(
+      is_prefetch &&
+      WebURLRequestToResourceType(request) != RESOURCE_TYPE_MAIN_FRAME);
   WebString error;
   extra_data->set_initiated_in_secure_context(
       frame->document().isSecureContext(error));
   request.setExtraData(extra_data);
 
   if (request.getLoFiState() == WebURLRequest::LoFiUnspecified) {
     if (is_main_frame_ && !navigation_state->request_committed()) {
       request.setLoFiState(static_cast<WebURLRequest::LoFiState>(
           navigation_state->common_params().lofi_state));
     } else {
@@ skipping 2267 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content